Ta có: 1-2003/2004 = 1/2004
1-2005/2006 = 1/2006
1/2004 > 1/2006
=> 2003/2004 < 2005 / 2006
\(\frac{2003}{2004}\)và \(\frac{2005}{2006}\)
\(1-\frac{2003}{2004}\)=\(\frac{1}{2004}\)
\(1-\frac{2005}{2006}\)=\(\frac{1}{2006}\)
Vì \(\frac{1}{2004}\)>\(\frac{1}{2006}\)
Nên \(\frac{2003}{2004}\)<\(\frac{2005}{2006}\)